[Bug fortran/97031] New: the content of a comment line breaks compilation
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97031 Bug ID: 97031 Summary: the content of a comment line breaks compilation Product: gcc Version: 4.4.7 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: jean-pierre.flam...@univ-lille.fr Target Milestone: --- Created attachment 49211 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49211&action=edit contains fortran pgm, system and compile info and output I would like to signal to you a compilation problem that I have solved. the following comment line ! some text... DIR/*/) seems to put the compiler into trouble. (see attachment) changing the line to ! some text... DIR/d2) solves the problem The attached file contains 1) the fortran (self contained) The faulty line is marked ==> FAULTY LINE, it is followed by the line ===> LINE OK 2) the system name (centos 6.10) and kernel 3) the command to compile 4) the output all these parts are sepaated by == lines I have also tested gfortran 6.3 (from devtoolset of centos) on the same computer (As far as I remember the errors are different but the compilation fails), and gfortran 4.9.3 also on a centos machine: same as 4.4.7). Sorry I have not access to newer versions of gfortran
[Bug fortran/97031] the content of a comment line breaks compilation
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97031 --- Comment #2 from jean-pierre.flam...@univ-lille.fr --- Thanks, However, if I launch "man cpp" or "man gfortran" I can't see anything in relation with my problem and traditional. I just noticed that cpp recognizes the extensions .fpp .F and other uppercase extensions. This is why I added -cpp in the gfortran command (otherwise I have a diagnostic because of #ifdef's I have renamed my file with the .fpp extension; with "-cpp" in the gfortran submission I get the same errors. If I compile the file with extension *.f or .fpp without -cpp 1) the compilation has no error 2) a #ifdef...#endif is recognized even with a .f extension, without -cpp, in my simple example, (I should check that the directive really is taken into account !) 3) IF I compile my full project in a makefile, the absence of "-cpp" in the gfortran command induces a "Illegal preprocessor directive" error in all the routines having that #ifdef...#endif - Mail original - De: "kargl at gcc dot gnu.org" À: "jean-pierre flament" Envoyé: Samedi 12 Septembre 2020 12:14:06 Objet: [Bug fortran/97031] the content of a comment line breaks compilation https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97031 kargl at gcc dot gnu.org changed: What|Removed |Added CC||kargl at gcc dot gnu.org --- Comment #1 from kargl at gcc dot gnu.org --- (In reply to jean-pierre.flament from comment #0) > Created attachment 49211 [details] > contains fortran pgm, system and compile info and output > > I would like to signal to you a compilation problem that I have solved. > > the following comment line > > ! some text... DIR/*/) > > seems to put the compiler into trouble. (see attachment) > > changing the line to > > ! some text... DIR/d2) > > solves the problem > > The attached file contains > > 1) the fortran (self contained) > The faulty line is marked ==> FAULTY LINE, > it is followed by the line ===> LINE OK > 2) the system name (centos 6.10) and kernel > 3) the command to compile > 4) the output > > all these parts are sepaated by == lines > > I have also tested gfortran 6.3 (from devtoolset of centos) on the same > computer (As far as I remember the errors are different but the compilation > fails), and gfortran 4.9.3 also on a centos machine: same as 4.4.7). > Sorry I have not access to newer versions of gfortran This should be closed as INVALID. You are preprocessing your code with cpp in traditional mode, and therefore the '/*' in your code is the start of a C comment. This is an user error. Not a problem with gfortran.
[Bug fortran/97031] the content of a comment line breaks compilation
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97031 --- Comment #4 from jean-pierre.flam...@univ-lille.fr --- see below: - Mail original - De: "kargl at gcc dot gnu.org" À: "jean-pierre flament" Envoyé: Dimanche 13 Septembre 2020 11:55:28 Objet: [Bug fortran/97031] the content of a comment line breaks compilation https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97031 --- Comment #3 from Steve Kargl --- On Sun, Sep 13, 2020 at 08:02:01AM +0000, jean-pierre.flam...@univ-lille.fr wrote: > > I just noticed that cpp recognizes the extensions .fpp .F and other uppercase > extensions. > This is why I added -cpp in the gfortran command (otherwise I have a > diagnostic > because of #ifdef's > > I have renamed my file with the .fpp extension; with "-cpp" in the gfortran > submission I get the same errors. > > If I compile the file with extension *.f or .fpp without -cpp > > 1) the compilation has no error > 2) a #ifdef...#endif is recognized even with a .f extension, without -cpp, in > my simple example, (I should check that the directive really is taken into > account !) > 3) IF I compile my full project in a makefile, the absence of "-cpp" in the > gfortran command induces > a "Illegal preprocessor directive" error in all the routines having that > #ifdef...#endif > I don't quite follow you. But, it come down to gfortran uses the C pre-processor when asked to pre-process a file. If you have a C language construct such as '/*' in your Fortran code it will cause problems. > In my remarks just above 2) and 3) I just wanted to point that, apprently, in addtion, gfortran+cpp seem to have a different behaviour when called in a makefile or in a simple command line. I can check that more. ===> as regards the intial point: do you find it normal that, processing a fortran file (and I imagine that CPP knows that point since it was launched within the gfortran command) CPP does not consider fortran comment lines as such, and ignores their content. In addition I noticed that there is a '*/' construct farther in the file in an other commented line (line = "... */ ...", and that thus all the stuff inbetween was ignored, suppresing all the declarations (character and others) ans some other statements; this explains the diagnostics of the compiler. another questions raises: the '*/' was within " ", i.e. a character string... a legal fortran statement. before commenting this line I had an other message reporting an end for file before the end of a comment (I don't remember exactly the formulation). That's why I finally decided to create the test file that you have, commenting all the lines with call's and the famous line = "" . I know understand what happened. but once again: cpp does not seem to understand the syntax of fortran ! this is very annoying !
[Bug fortran/97031] the content of a comment line breaks compilation
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97031 --- Comment #5 from jean-pierre.flam...@univ-lille.fr --- I am sorry to bother you once again, for the last time. I have now understood all things that happened while compiling the very complicated (!) program below. program tstmak implicit none ! a comment with /* integer :: i ! #ifdef _MYDEBUG_ print *,' debug printing' #endif i = 25 print *,'normal printing: i=',i end program tstmak I compiled this fortran with and without -cpp, and always with -D_MYDEBUG_ in a command like that one gfortran -v -ffree-form -Wall -msse2 -g -fbounds-check -fbacktrace -D_MYDEBUG_ -cpp tstmak1.f -o v1 1) if -cpp is PRESENT a) the '/*' in the comment line causes a great problem (in that case an "end of file") and no executable is produced b) if I change the '/*' to anything else, no message, the executable is produced, and prints what is expected 2) if -cpp is ABSENT a) the '/*' in the comment line has no catastrophic effect, but a WARNING appears "Warning: tstmak.f:6: Illegal preprocessor directive" however the executable is produced, and prints what is expected It is because of this warning (and not an error) that I always put "-cpp" in my makefiles ! ===> conclusion: gfortran "tolerates" and understands "#" type directives. This is in opposition to other compilers, which also caused my trouble Sorry for the disturbance JP Flament - Mail original - De: "kargl at gcc dot gnu.org" À: "jean-pierre flament" Envoyé: Dimanche 13 Septembre 2020 11:55:28 Objet: [Bug fortran/97031] the content of a comment line breaks compilation https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97031 --- Comment #3 from Steve Kargl --- On Sun, Sep 13, 2020 at 08:02:01AM +, jean-pierre.flam...@univ-lille.fr wrote: > > I just noticed that cpp recognizes the extensions .fpp .F and other uppercase > extensions. > This is why I added -cpp in the gfortran command (otherwise I have a > diagnostic > because of #ifdef's > > I have renamed my file with the .fpp extension; with "-cpp" in the gfortran > submission I get the same errors. > > If I compile the file with extension *.f or .fpp without -cpp > > 1) the compilation has no error > 2) a #ifdef...#endif is recognized even with a .f extension, without -cpp, in > my simple example, (I should check that the directive really is taken into > account !) > 3) IF I compile my full project in a makefile, the absence of "-cpp" in the > gfortran command induces > a "Illegal preprocessor directive" error in all the routines having that > #ifdef...#endif > I don't quite follow you. But, it come down to gfortran uses the C pre-processor when asked to pre-process a file. If you have a C language construct such as '/*' in your Fortran code it will cause problems.
